feat: add button to navigate to Funnels page in SiteDashboardPage for improved user navigation

lib/api/funnels.ts

@@ -0,0 +1,74 @@
+import apiRequest from './client'
+
+export interface FunnelStep {
+  order: number
+  name: string
+  value: string
+  type: string // "exact", "contains", "regex"
+}
+
+export interface Funnel {
+  id: string
+  site_id: string
+  name: string
+  description: string
+  steps: FunnelStep[]
+  created_at: string
+  updated_at: string
+}
+
+export interface FunnelStepStats {
+  step: FunnelStep
+  visitors: number
+  dropoff: number
+  conversion: number
+}
+
+export interface FunnelStats {
+  funnel_id: string
+  steps: FunnelStepStats[]
+}
+
+export interface CreateFunnelRequest {
+  name: string
+  description: string
+  steps: FunnelStep[]
+}
+
+export async function listFunnels(siteId: string): Promise<Funnel[]> {
+  const response = await apiRequest<{ funnels: Funnel[] }>(`/sites/${siteId}/funnels`)
+  return response?.funnels || []
+}
+
+export async function getFunnel(siteId: string, funnelId: string): Promise<Funnel> {
+  return apiRequest<Funnel>(`/sites/${siteId}/funnels/${funnelId}`)
+}
+
+export async function createFunnel(siteId: string, data: CreateFunnelRequest): Promise<Funnel> {
+  return apiRequest<Funnel>(`/sites/${siteId}/funnels`, {
+    method: 'POST',
+    body: JSON.stringify(data),
+  })
+}
+
+export async function updateFunnel(siteId: string, funnelId: string, data: CreateFunnelRequest): Promise<Funnel> {
+  return apiRequest<Funnel>(`/sites/${siteId}/funnels/${funnelId}`, {
+    method: 'PUT',
+    body: JSON.stringify(data),
+  })
+}
+
+export async function deleteFunnel(siteId: string, funnelId: string): Promise<void> {
+  await apiRequest(`/sites/${siteId}/funnels/${funnelId}`, {
+    method: 'DELETE',
+  })
+}
+
+export async function getFunnelStats(siteId: string, funnelId: string, from?: string, to?: string): Promise<FunnelStats> {
+  const params = new URLSearchParams()
+  if (from) params.append('from', from)
+  if (to) params.append('to', to)
+  
+  const queryString = params.toString() ? `?${params.toString()}` : ''
+  return apiRequest<FunnelStats>(`/sites/${siteId}/funnels/${funnelId}/stats${queryString}`)
+}